<template>
  <div class="login-container">
    <!-- NavBar导航栏 -->
    <van-nav-bar class="page-nav-bar" title="登录">
      <van-icon slot="left" name="cross" @click="$router.back()" />
    </van-nav-bar>
    <!-- /NavBar导航栏 -->
    <!-- Form表单 -->
    <van-form @submit="onSubmit" ref="loginForm">
      <van-field
        v-model="user.mobile"
        name="mobile"
        placeholder="请输入手机号"
        :rules="userFormRules.mobile"
        type="number"
        maxlength="11"
      >
        <i slot="left-icon" class="toutiao toutiao-shouji"></i>
      </van-field>
      <van-field
        v-model="user.code"
        name="code"
        placeholder="请输入验证码"
        :rules="userFormRules.code"
        type="number"
        maxlength="6"
      >
        <i slot="left-icon" class="toutiao toutiao-yanzhengma"></i>
        <!-- 短信验证码 -->
        <template #button>
          <!-- time:倒计时时间 -->
          <van-count-down
            :time="1000 * 10"
            format="ss s"
            v-if="isCountDownShow"
            @finish="isCountDownShow = false"
          />
          <van-button
            round
            size="small"
            native-type="button"
            class="send-sms-btn"
            type="default"
            @click="onSendSms"
            v-else
            >发送验证码</van-button
          >
        </template>
      </van-field>
      <div style="margin: 16px" class="login-btn-wrap">
        <van-button block type="info" native-type="submit" class="login-btn"
          >登录</van-button
        >
      </div>
    </van-form>
    <!-- /Form表单 -->
  </div>
</template>

<script>
import { login, sendSms } from '@/api/user.js'
export default {
  name: 'LoginIndex',
  components: {},
  props: {},
  data () {
    return {
      user: {
        mobile: '',
        code: '' // 246810
      },
      userFormRules: {
        mobile: [
          {
            required: true,
            message: '手机号不能为空'
          },
          {
            pattern:
              /^(13[0-9]|14[579]|15[0-3,5-9]|16[6]|17[0135678]|18[0-9]|19[89])\d{8}$/,
            message: '手机号格式错误'
          }
        ],
        code: [
          {
            required: true,
            message: '验证码不能为空'
          },
          {
            pattern: /^\d{6}$/,
            message: '验证码格式错误'
          }
        ]
      },
      isCountDownShow: false // 是否展示倒计时
    }
  },
  computed: {},
  watch: {},
  created () {},
  mounted () {},
  methods: {
    async onSubmit () {
      // console.log(this.user)
      // 1.获取表单数据(数据的双向绑定)
      const user = this.user
      // 2.表单验证
      /**
       * 表单验证
       * 1.给van-filed组件配置rules验证规则
       *   验证规则 参考文档
       * 2.当表单提交的时候会自动触发表单验证
       *    如果验证通过,会触发submit事件
       *    如果验证失败不会触发submit事件
       */

      // 轻提示
      // 在组件中必须通过this.$toast来调用Toast组件
      this.$toast.loading({
        message: '登录中...',
        forbidClick: true, // 过 forbidClick 属性可以禁用背景点击
        duration: 0 // 展示时长(ms)，值为 0 时，toast 不会消失
      })
      // 3.提交表单请求登录(使用async和await用try catch来捕获异常) try catch (if(err.response && err.response.status === 400){手机和验证码错误})
      try {
        const { data } = await login(user)
        // 把token存储到vuex中
        this.$store.commit('setUser', data.data)
        // console.log('登录成功', data)
        this.$toast.success('登录成功') // 任何一个新的toast被调用都会关闭之前的toast
        // 登录成功，跳转回原来的页面
        // back方式不严谨,后面说
        // console.log(this.$route.query.backpage)
        this.$router.back()
      } catch (error) {
        if (error.response && error.response.status === 400) {
          this.$toast.fail('手机号或者验证码错误')
        } else {
          this.$toast.fail('登录失败,请稍后重试')
        }
      }

      // 4.根据请求响应结果后续操作
    },
    async onSendSms () {
      // 1.校验手机号
      try {
        await this.$refs.loginForm.validate('mobile') // 返回一个promise对象
        console.log('验证通过')
      } catch (error) {
        return console.log('验证失败', error)
      }
      // 2.验证通过，显示倒计时
      this.isCountDownShow = true
      // 3.请求发送验证码
      try {
        await sendSms(this.user.mobile)
        this.$toast.success('发送成功')
      } catch (error) {
        // 发送失败关闭倒计时
        this.isCountDownShow = false
        if (error.response && error.response.status === 429) {
          this.$toast.fail('发送太频繁，请稍后重试')
        } else {
          this.$toast.fail('发送失败,请稍后重试')
        }
      }
    }
  }
}
</script>

<style scoped lang="less">
.login-container {
  .toutiao {
    font-size: 37px;
  }
  .send-sms-btn {
    // width: 160px;
    height: 46px;
    line-height: 46px;
    background-color: #ededed;
    font-size: 22px;
    color: #666;
  }
  .login-btn-wrap {
    padding: 53px 33px;
    .login-btn {
      background-color: #6db4fb;
      border: none;
    }
  }
}
</style>
